Class 5 - Division 5.2

Organic peroxides are organic substances that are thermally unstable and can undergo exothermic, self-accelerating decomposition. They contain the bivalent structure -O-O- and may be considered derivatives of hydrogen peroxide.

Organic peroxides can have one or more of the following properties:

• Liable to explosive decomposition
• Burn rapidly
• Sensitive to impact or friction
• React dangerously to other substances
• Cause damage to the eyes

Certain organic peroxides can damage the cornea, even after brief contact, and they can be corrosive to the skin.

Decomposition can be started by heat, contact with impurities (such as acid or heavy metals), friction, or impact. The rate of decomposition increases with temperature and varies based on the peroxide formulation. Harmful or flammable gases and vapors may result from the decomposition.

Examples of organic peroxides include:

• Hydrogen peroxide
• Calcium peroxide
• Fertilizers
• Pool chemicals

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